The method used to clamp the light down will eventually fail, and the light will work loose very fast once the plastic has worn off. I intend to repair mine with some thin rubber and see how that holds. In the meantime, I have bought a new, and much better system.
Pros: Works OK at first.
Cons: It will fail on you, don't try it on a shotgun or rifle.
This review was written in the old system and had content requirements that are different than reviews written today.